<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <!-- <input type="text" v-model="message" /> -->
      <!-- 通过:value来数据绑定，通过事件来更新model -->
      <!-- 自动传入event，可以省略参数-->
      <!-- <input type="text" :value="message" @input="valueChange" /> -->
      <input
        type="text"
        :value="message"
        @input="message = $event.target.value"
      />

      <h2>{{message}}</h2>
    </div>

    <script src="../js/vue.js"></script>

    <script>
      const app = new Vue({
        el: "#app",
        data: {
          message: "你好",
        },
        methods: {
          valueChange(event) {
            // console.log(event.target.value);
            this.message = event.target.value;
          },
        },
      });
    </script>
  </body>
</html>
